Electric grate



July 1, 1924.

J. H. CARMEAN ELECTRIC GRATE Filed Nov. 30

Patented July l, 1924.

" UNITED STATES J' AMES H. CARMEAN, OF KANSAS CITY, MISSOURI.

ELECTRIC GRATE.

Application filed November 30, 1923. Serial No. 677,691.

To all -wlzom t may concern Be it known that I, JAMES H. CARMEAN, a citizen of the United States, residing at Kansas City, in the county of Jackson and- State of Missouri, have invented certain new and useful Improven'ients in Electric Gratos; and I do declare the following to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the-same, reference being had to the accompanying drawings, andto the figures of reference marked thereonwhich form a part of this specification.

This invention relates to electric heaters and particularly to .an electric grate for heating purposes. the invention is to providea nov'el form of electric heating element which may be constructed to simulate a coal grate, the construction being -such that the heating elements may be novelly supported in the grate With loose material surrounding the elements and coarse enough to provide interstices through which the air may pass, the coarse loose material having considerable heat conductivity and the heat being carried away by the air passing through theinterstices.

lI am aware that prior to my invention, heaters. have been provided by embedding electric heating elements in certain appropriate embedding material, but in such heaters the heating elements were insulated from the air and the conductivity of the air was limited to the exterior of the embedding material.

According to my invention however the heating element is exposed to atmosphere and the air passing through the interstices of the bed will provide great heat conductivity so that the coarse material will be heated in an efficient manner and give up heat to the air passing around in proximity thereto. I have provided a novel form of heater casing or grate which may be inexpensively manufactured, expeditiously assembled and conveniently transported from A place to -place as occasion may demand.

In the drawings, Fig. l is a perspective view of a grate constructed 1n accordance with my invention.

Fig. 2 is a cross sectional view, and Fig. 3 is a side elevational view, parts The primary object of being broken away to illustrate the method of supporting the heating elements.

The grate Icasing consists of two end members l and 2, each of which is a duplicate of the other, the two end members being formed alike so that a single casting may do for either end. Each end member is provided with arcuate inwardly projecting flanges 3, so thatthe half round sheet metal grate member t may be fastened to the two flanges 3-3 on the respective end members l and 2, the fastening being accomplished preferably through the medium of screws 5. The end members are provided with legs 6 and 7 to support the main body of the s ate above the floor.

The end membersare provided with inwardly projecting lugs 8 to be received by the tubular element porcelains or cores 9 so that the porcelains or cores will be properlysupported. The heating elements are provided with resistance wire preferably ni- -chrome wire which I wind in the usual way about the cores 9 'and the wires may be connected to binding posts l1 as will be Well understood. Current may be turned 0H and on by suitable switches, not shown.

I prefer to arrange two heating elements in each grate body and so wire up the windings that either one or both heating elements may be on at one time. In the grate I place suitable divided loose refractory material 12, coarse enough to provide spaces or interstices between them so that air may pass up pass up through the divided material and cont-act with the surfaces 'of the various elements of the divided material and over the resistance wire. The refractory material will have heat conducted to it by the hot air and by conduction from the heat elements so that it will heat to a cherry red giving a very attractive and eiiicient bed for the grate.

It will be observedv that the receptacle is perforated or provided with slits 13 for the ters Patent is:

A hesiter comprising :L receptacle having two duplicate ends,

each having an iriwardly projecting lug, a, heater element com4 prising a tube receiving the ends of said lugs, means for astening the two ends toy gether to cause the lugs to engage the heater element and coarse loose material surrounding the heating'element. i In testimony whereof I aiix my signa,- ture.

AJAMES H. CARMEAN. 

